François Guérin was deputy managing director of ANACT in charge of the scientific and technical department. He is now consultant in Ergonomics and Work Organization. Antoine Laville was the director of Physiological and Cognitive Ergonomics at the École pratique des Hautes Études. François Daniellou is professor of Ergonomics at Bordeaux University, Director of the Ergonomics of complex systems. Jacques Duraffourg is consultant and professor in Ergonomics at the University of Aix-Marseille. Director of SARL Activity. Alain Kerguelen is a research engineer at the CNRS.